Fuel-feed mechanism for internal-combustion engines.



E. A. JOHNSTON.

FUEL FEED MECHANISM FOR IIITERNAL COMBUSTION ENGINES.

Patentfid Feb: 19, 1918.

3 SHEET3-SHEET 1.

APPLICATION FILED JUNE 6. 1912.

E. A. JOHNSTON.

FUEL FEED MECHANISM FOR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED JUNE 6. I912. 1,257,243. Patented Feb.19,1918.'

3 SHEETS-SHEET 2.

31 Illl lllilll|llIIIIlliflIiiIllllilililiilllillilllm 3 I E. A. JOHNSTON.

FUEL FEED MECHANISM FOR INTERNAL COMBUSTION ENGINES.

Patented Feb. 19, 1918.

APPLICATION FILED JUNE 6, I912.

8 v E gIIIIIIg IIIIIIIIIIIII I I unrrnn s'rarns Parana ornron EDWARD A. JOHNSTON, OF CHICAGO, ILLINOIS, ASSIGNOR, BY MESNE ASSIGNMENTS, TO INTERNATIONAL HARVESTER CORPORATION, A CORPORATION OF NEW JERSEY.

FUEL-FEED MECHANISM FOR INTERNAL-COMBUSTION ENGINES.

Specification of Letters Patent.

Patented Feb. 19, 1918.

Application filed June 6, 1912. Serial No. 701,949.

To all whom it may concern:

Be it known that I, EDWARD A. JOHN- s'rox, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Fuel-Feed Mechanism for Internal-Combustion Engines.

My invention relates to internal combustion engines, and in particular to means whereby the amount of fluid admitted to the mixing chamber is automatically controlled by the governor mechanism in a manner permitting a measured quantity to pass to the chamber determined by the load upon the engine; the object of my invention being to provide a mechanism that'will be efficient in operation and easily and readily adjustable to meet the varying conditions. I attain these objects by means of the mechanism illustrated by the accompanying draw ings, in which- Figure 1 represents a side elevation of an internal combustion engine having my invention forming a part thereof;

Fig. 2 represents a side elevation of part of the fuel feed mechanism detached from the engine;

Fig. 3 is a top plan view of Fig. 2, having some of its parts broken away;

Fig. 4 is a section of part of Fig. line AB;

Fig. 5 is a section of part of Fig. line CD;

6 is a section of part of Fig. line EF; and

Fig. 7 is a perspective elevation of part of the fuel measuring mechanism as detac ed from Fig. 2.

The same reference characters designate like parts throughout the several views.

1 represents an internal combustion engine having a crank case 2. in which is journaled the engine crank shaft 3 and power cylinder 4 including a cvlinder head 5. 6 represents the cam shaft, which may be driven by the crank shaft in anv preferred manner. The governor mechanism may be of any of the centrifugal forms driven from the cam shaft and operatively connected with a rock shaft 7 iournaled in a casing 8 adapted to inclose the associated parts of the governor mechanism. 8 represents a depending lever arm secured to the rock shaft 7. 9 represents a common form of ec- 3 along 3 along 2 along centric mechanism mounted uponthe cam shaft 6; 10 represents the body of a vertically arranged'mixing chamber having a flange base 11 whereby it is secured to the cylinder head, and a flange portion 12 at the upper end thereof whereby it is secured to the lower end of an air pipe 13. 14: represents a common form of constant level water feed cup secured to the upper end of the body of the mixing chamber and having a needle valve 15 adapted to control the admission of water from the cup to said chamber, and 16 represents an air throttling valve carried by a rocking stem 17 journaled in opposite walls of the chamber below the water inlet and having a lever arm 19 secured to one end thereof. 20 repre seats a manually controlled air throttling valve located in the air pipe above the water inlet; 21 represents a fuel feed cup having a horizontal rectangular base portion 22 whereby it is secured to the body of the mixing chamber by means of bolts 23. A vertically arranged cylindrical portion 25 is adapted to receive a rocking valve member 26. 27 represents a semi-circular chamber partially surrounding the cylindrical portion 25 and divided into two receptacles by means of a partition wall 28. one of said rece tacles communicating with a source of combustible fluid, not shown by means of a pipe 29, and having a drain pipe 30 leading from the bottom thereof, the remaining receptacle upon the opposite side of the cylindr cal portion having an overflow pipe 31 leading therefrom, and the two receptacles provided with a cover plate 32 secured to the outer wall thereof bv means of screws 33. 34: represents two fuel feed passages extending through the lower por tion of thecup in the direction of the body of the mixing chamber. one above the other in a vertical plane and in parallel relation, separated by a thin partition wall 35. 36 represents a spraying tube carried by the feed cup and having one end thereof communicating with the fuel feed passages and the body thereof extending into the body of the mixing chamber and provided with a series of slotted openings 37 in the bottom thereof, the end of the tube being closed, and 38 represents a choke ring resting upon the upper side of the tube and operative in a well-known manner to deflect the air in ward and cause it to meet the incoming fuel with a greater force. Valve member 26 is provided with a diametrical and longitudinally arranged slot 39 that extends from the upper end thereof to near the lower end, and 40 represents a flat throttling valve that is slidably received by the slot and adapted to move longitudinally therein in a manner to open more or less of the lower end of the slot for the reception of a charge of combustible fluid. The throttling valve is provided with a flattened stem portion 11 at the upper end that is slidably received by an opening in a cap plate i2 that covers the upper end of the rotary valve, and a3 repre sents a head secured to the upper end of the stem. 4% represents a coiled spring surrounding the body of the stem and operative between the head and the cap in a manner to press the latter upon the end of the rotary valve and to lift the throttling valve. Secured to the upper end of the retary valve is an arm that is connected with the eccentric mechanism by means of a rod 16, whereby the valve is rocked in its bearing in a common way. 4:? represents oppositely disposed rectangular ports through the walls of the cylinder 25, at the lower end thereof, at right angles with the fuel passage 34 and communicating with the adjacent fuel receptacles. 48 represents a supplemental air intake communicating with the fuel feedpassages 3 1 upon the side of the cup opposite that of the body of the mixing chamber. The overflow pipe 31 extends upward into the receptacle to a plane slightly above the upper level of the upper feed passage and the top of the partition. wall 28 is below the upper end of the cup, permitting the liquid fuel to flow from one receptacle to the other and maintaining the level in the one to the top of the partition wall and in the other to the upper end of the outflow pipe.

The lever arm 19, secured to the stem 17 of the air throttling valve 16, is connected with the lever arm 8 by means of a rod 49, and integral with the arm 19 is a vertically arranged barrel portion 50 carrying an adjustable screw 51 having a binding nut 52. the lower end of the screw engaging with the head 43 of the stem of the throttling valve 40. 52 represents an arm inte gral with the lever arm 19 and arranged at right angles therewith. 53 represents a tension spring having one end connected with arm 19 and the opposite end thereof with a clip memberbat adjustably secured tov the rod 49, and 55 represents a contact member carried by'the arm and adapted to limita swinging movement thereof in one direction by engaging with the rod.

In operation the rocking valve member 26, in its initial position, as shown by full lines inFig. 6, permits, a charge of liquid fuel'to flow through the ports 47 into the lower end of the slot 39 and fill the portion not occupied by the throttling valve 10, and when the valve 26 is rocked by means of the eccentric mechanism 9 to a position as shown by dotted lines in Fig. 6, the charge is drawn through the feed passages 34 and spray pipe 36 into the body of the mixing chamber; the amount of liquid fuel admitted being controlled by the position of the throttling valve 40, which position is controlled by the governor mechanism, As the speed of the engine increases the valve 40 and is moved downward, closing more or less of the opening at the lower end of the slot 39, and the air throttling valve 16 is simultaneously closed, the two valves being moved in unison.

lVhat I claim as my invention, and dcsire to secure by Letters Patent, is: g 1. In a carbureter for internal combustion engines, a source of fuel supply, a source of air supply, and an oscillatory member having a variable opening therethrough and being associated with both sources of supply, said member in one position being adapted to receive a charge of fuel from the fuel supply source and which in another position has the fuel removed therefrom by air from the air supply source passing through the opening in said member.

In a carbureter for internal combustion engines, a source. of fuel supply, a source of air supply, an oscillatory member having an opening therethrough and being associated with both sources of supply, said member in one position being adapted to receive a charge of fuel from the fuel supply source and which in another position has the fuel removed therefrom by air from the air supply source passing through the opening in said member, and means associated with said member for varying the quantity of the charge of fuel taken from the source of fuel supply.

3. In a. earbureter for internal combustion engines, a source of fuel supply, a source of air supply, a member having an opening therein and being associated with both sources of supply, said member in one position being adapted to receive a charge of fuel from the fuel supply source and which in another position has the fuel removed therefrom by air from the air supply source, and means associated with said member for automatically varying the quantity of the charge of fuel taken from the source of fuel supply.

4. In a carbureter for internal combustion engines, the combination of a source of fuel supply, a source of air supply, and a valve having a governor controlled opening therethrough which in one position registers with the fuel supply to receive a. charge of fuel and in another position registers with the air supply whereby air passes through said opening to remove the fuel therefrom.

5. In a carbureter for internal combustion engines, the combination of a source of fuel supply, primary and auxiliary sources of air supply, and a member associated with said fuel and air supplies which in one position is adapted to receive a charge of fuel from the fuel supply source and which in another position has the fuel blown therefrom into the primary air by the auxiliary air.

6. In a carbureter for internal combus lion engines, the combination of a source of fuel supply, two sources of air supply, and a member associated with said fuel and air supplies which in one position is adapted to receive a charge of fuel from the fuel supply source and which in another position' has the fuel blown therefrom into one supply by the air from the other supply.

7 In a carbureter for internal combustion engines, the combination of a source of fuel supply, two sources of air supply, a member associated with said fuel and air supplies which in one position is adapted to receive a charge of fuel from the fuel supply source and which in another position has the fuel blown therefrom into one supply by the air from the other supply, and means for varying the quantity of charge of fuel taken from the source of fuel supply.

8. In a carburetor for internal combustion engines, the combination of a source of fuel supply, two sources of air supply, a member associated with said sources of fuel and air supply which in one position receives a charge of fuel and in another position has the fuel removed therefrom by air from one of said air supplies, means associated with said member to determine the quantity of fuel charge, a member controlling one of the sources of air supply, and means for simultaneously controlling said charge determining means and the air controlling member.

9. A carbureter for internal combustion engines having. in combination, a constant level fuel feed cup, a mixing chamber. acylindrical rocking valve member provided with a diametrical and longitudinally arranged slot having one end thereof adapted to communicate with said cup and with said mixing chamber. a governor controlled charge throttling valve slidabl received by the slotted portion of said rocking valve and operative to control the area thereof communicating with said feed cup, and means whereby said rocking valve may be connected with a moving part of the engine.

10. A carbureter for internal combustion engines having, in combination, a constant trolled charge throttling valve slidably received by said slot and operative to control the area thereof communicating with said feed cup, said air and charge throttling valves being simultaneously controlled, and means whereby said rocking valve may be connected with a moving part of the engine.

11. A carbureter for internal combustion engines having, in combination, a mixing chamber, an air throttling valve including a rocking stem mounted in said chamber, a governor controlled lever arm secured to said stem, a constantlevel fuel feed cup including a rocking vertically arranged cylindrical valve member journaled therein and provided with a diametrical and longitudinally arranged slot, having the lower end thereof adapted to communicate with said cup and with said mixing chamber, an arm secured to the upper end of said rocking valve, operative connections between said arm and a moving part of the engine, a charge throttling valve slidably received by said slot and operative to control the area tiereof communicating with said feed cup, a spring operative to move said valve in one direction, and an arm carried by the stem of said air throttling valve and operative to move said charge throttling valve in an opposite direction. I

12. A carbureter for internal combustion engines having, in combination, amixing.

chamber, a fuel feed mechanism communicating with said chamber, said feed mechanism including a constant level feed cup having a vertically arranged cylinder. a rocking valve member received by said cylinder and having a diametrical and longitudinally arranged slot therein, a governor controlled charge throttling valve slidably received by said slot, two receptacles for liquid adjacent said cylinder. oppositelv disposed ports in the walls of said cvlinder and communicating with said receptacles and with the lower end of the slot in said valve member. fuel feed passages arranged at right angles with said ports and communieating with said mixing chamber. and an operative connection between said rocking valve member and a moving part of the engine wherebv said valve member is rocked in reverse directions in a manner to cause the slotted portion thereof to communicate alternately with said ports and fuel feed passages.

13. A carburetor for internal combustion engines having. in combination, a mixing chamber, a fuel feed mechanism communiwith said ports and said feed passages, a governor controlled charge throttling valve slidably received by the allotted portion of said rocking valve member and an operative connection between said rocking valve member and a moving part of the engine whereby said valve member is rocked in reverse directions in a manner to cause the slotted portion thereof to communicate a-ltcrnateh with said ports and fuel feed passa es:

EDWARD A. JQHNSTON.

Witnesses NM. F. KELLEY, Lno J. Fonsrnn.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

Washington, D. C. 

